/* Tic - Tac - Toe Program */

#include <stdio.h>
#include <conio.h>
#include <math.h>
#include <limits.h>
#include <stdlib.h>
#include <time.h>

char Square[3][3];
Initlize ();
Displayboard ();
Getmove ();
Makemove ();
Canwin (char xoro);
Checkwin (char letter);

main ()
	{
	clrscr ();
	char again;
	int moveCounter;

	while (1 == 1)
		{
		Initlize ();
		Square[0][0] = 'X';
		Displayboard ();
		Getmove ();
		Makemove ();
		moveCounter = 3;

		while (1 == 1)
			{
			Displayboard ();
			Getmove ();
			moveCounter = moveCounter + 1;

			if (Checkwin ('O') == 1)
				{
				Displayboard ();
				printf ("Congratulations!! You win. \n");
				break;
				}
			else
				{
				if (Canwin ('X') == 1)
					{
					Displayboard();
					printf ("I win. Ah Haa!! \n");
					break;
					}
				else
					{
					if (Canwin ('O') == 0)
						{
						Makemove ();
						}
					}
				}
			moveCounter = moveCounter + 1;
			if (moveCounter == 9)
				{
				Displayboard ();
				printf ("It's a draw. Good game. \n");
				}
			else
				{
				continue;
				}
			}
		printf ("\nDo you want to play again (Y/N)? ");
		scanf ("\n%c", &again);
		if (again == 'Y' || again == 'y')
			{
			continue;
			}
		else
			{
			break;
			}
		}
	}

Canwin (char xoro)
	{
	int row, col;
	row = 0;
	while (row < 3)
		{
		col = 0;
		while (col < 3)
			{
			if (Square [row][col] == ' ')
				{
				Square [row][col] = xoro;
				if (Checkwin (xoro) == 'X')
					{
					Square [row][col] = ' ';
					}
				else
					{
					if (Checkwin (xoro) == 'O')
						{
						Square [row][col] = ' ';
						}
					return 1;
					}
				}
			col = col + 1;
			}
		row = row + 1;
		}
	return (xoro);
	}

Checkwin (char letter)
	{
	int counter = 0;
	while (counter < 3)
		{
		if (Square [counter][0] == letter && Square [counter][1] == letter && Square [counter][2] == letter)
			{
			return 1;
			}
	else
			{
			counter = counter + 1;
			}
		}
	counter = 0;
	while (counter < 3)
		{
		if (Square [0][counter] == letter && Square [1][counter] == letter && Square [2][counter] == letter)
			{
			return 1;
			}
		else
			{
			counter = counter + 1;
			}
		}
		if (Square [0][0] == letter && Square [1][1] == letter && Square [2][2] == letter)
			{
			return 1;
			}
		if (Square [0][2] == letter && Square [1][1] == letter && Square [2][0] == letter)
			{
			return 1;
			}
	return (letter);
	}

Initlize ()
	{
	int row, col;
	row = 0;
	while (row < 3)
		{
		col = 0;
		while (col < 3)
			{
			Square [row][col] = ' ';
			col = col + 1;
			}
		row = row + 1;
		}
	return 0;
	}

Displayboard ()
	{
	printf ("\n\n\n\n\n\n\n\n");
	printf ("\t\t\t\t   COLUMN \n");
	printf ("\t\t\t\t  1   2   3 \n\n");
	printf ("\t\t\t       1  %c | %c | %c \n", Square [0][0], Square [0][1], Square [0][2]);
	printf ("\t\t\t   R     ----------- \n");
	printf ("\t\t\t   O   2  %c | %c | %c \n", Square [1][0], Square [1][1], Square [1][2]);
	printf ("\t\t\t   W     ___________ \n");
	printf ("\t\t\t       3  %c | %c | %c \n", Square [2][0], Square [2][1], Square [2][2]);
	printf ("\n\n\n\n\n\n");

	return 0;
	}

Getmove ()
	{
	int row, col;
	while (1 == 1)
		{
		printf ("\nWhat row will you put O in ?");
		printf ("\n Enter a number from 1 to 3 : ");
		scanf ("%d", &row);
		printf ("\nWhat column will you put O in ?");
		printf ("\nEnter a number from 1 to 3 : ");
		scanf ("%d", &col);

		row = row - 1;
		col = col - 1;

		if (row < 0 || row > 2 || col < 0 || col > 2 || Square [row][col] != ' ')
			{
			printf ("%c", 7);
			Displayboard ();
			continue;
			}
		else
			{
			Square [row][col] = 'O';
			break;
			}
		}
	return 0;
	}

Makemove ()
	{
	if (Square [0][0] == ' ')
		{
		Square [0][0] = 'X';
		}
	else if (Square [1][1] == ' ')
		{
		Square [1][1] = 'X';
		}
	else if (Square [2][2] == ' ')
		{
		Square [2][2] = 'X';
		}
	else if (Square [1][0] == ' ')
		{
		Square [1][0] = 'X';
		}
	else if (Square [1][1] == ' ')
		{
		Square [1][1] = 'X';
		}
	else if (Square [1][2] == ' ')
		{
		Square [1][2] = 'X';
		}
	else if (Square [2][0] == ' ')
		{
		Square [2][0] = 'X';
		}
	else if (Square [2][1] == ' ')
		{
		Square [2][1] = 'X';
		}
	else if (Square [2][2] == ' ')
		{
		Square [2][2] = 'X';
		}
	return 0;
	}